/*
 * Copyright (c) 2016-2088, fastquery.org and/or its affiliates. All rights reserved.
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For more information, please see http://www.fastquery.org/.
 *
 */

package org.fastquery.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

import org.fastquery.core.MethodInfo;
import org.fastquery.core.QueryContext;

/**
 * 仅为测试服务
 *
 * @author mei.sir@aliyun.cn
 */
public class QueryContextUtil
{

    private static QueryContext getQueryContext() throws Exception
    {
        Class<QueryContext> clazz = QueryContext.class;
        Constructor<QueryContext> constructor = clazz.getDeclaredConstructor();
        constructor.setAccessible(true);
        return constructor.newInstance();
    }

    @SuppressWarnings("unchecked")
    private static ThreadLocal<QueryContext> getThreadLocal() throws Exception
    {
        Class<QueryContext> clazz = QueryContext.class;
        Field field = clazz.getDeclaredField("threadLocal");
        return (ThreadLocal<QueryContext>) TypeUtil.getFieldVal(null, field);
    }

    public static void setCurrentMethod(Method method) throws Exception
    {
        QueryContext queryContext = getThreadLocal().get();
        Field mf = QueryContext.class.getDeclaredField("methodInfo");
        mf.setAccessible(true);
        mf.set(queryContext, new MethodInfo(method));
    }

    public static void setCurrentArgs(Object... args) throws Exception
    {
        QueryContext queryContext = getThreadLocal().get();
        Field af = QueryContext.class.getDeclaredField("args");
        af.setAccessible(true);
        af.set(queryContext, args);
    }

    public static void startQueryContext() throws Exception
    {
        getThreadLocal().set(getQueryContext());
    }

    public static void clearQueryContext() throws Exception
    {
        getThreadLocal().remove();
    }
}
